Working on designing an SPL box to compete with, the system belongs to my friend but we're trying to pass the 150dB mark.
Equipment is 4 American Bass XFL 15"s and 2 APSM-1500's, the subs will certainly be underpowered because the car will get upgrades later on to push more power and get more amps, however I'm trying to see how far I can get on this power with these subs.
So far from some basic calculations it's looking like 16.7cf internal before port displacement and with a quick design I did it seems I can get 15.55cf internal after port tuned to 46hz with 248 in^2 of port area.
Now his current system is 2 XFL 15"s on only 1000watts and we managed to pull off 141.6dB at 49hz in a ford festiva
(looks like this http://photos.carsguide.news.com.au/cgphotos/specs_photos/5DO.jpg).
The current box is 6.5cf internal after port tuned to 32hz with very little port area because we struggled to fit it in the boot (something miserable like only 57in^2) so by no means an SPL box.
My question is, if the loudness peaked at 49hz with that box should I tune slightly lower like 46hz then play say a 50hz tone to get the max SPL out of this car? I know maximizing volume and port area are common sense but knowing which frequency to tune to and play for SPL is something I haven't dealt with before, I usually make music boxes.
Cheers.
Equipment is 4 American Bass XFL 15"s and 2 APSM-1500's, the subs will certainly be underpowered because the car will get upgrades later on to push more power and get more amps, however I'm trying to see how far I can get on this power with these subs.
So far from some basic calculations it's looking like 16.7cf internal before port displacement and with a quick design I did it seems I can get 15.55cf internal after port tuned to 46hz with 248 in^2 of port area.
Now his current system is 2 XFL 15"s on only 1000watts and we managed to pull off 141.6dB at 49hz in a ford festiva
(looks like this http://photos.carsguide.news.com.au/cgphotos/specs_photos/5DO.jpg).
The current box is 6.5cf internal after port tuned to 32hz with very little port area because we struggled to fit it in the boot (something miserable like only 57in^2) so by no means an SPL box.
My question is, if the loudness peaked at 49hz with that box should I tune slightly lower like 46hz then play say a 50hz tone to get the max SPL out of this car? I know maximizing volume and port area are common sense but knowing which frequency to tune to and play for SPL is something I haven't dealt with before, I usually make music boxes.
Cheers.
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